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Time Deposits - Summary of Large time Deposits for Periods Presented (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Investments Schedule [Abstract] |  |
Time deposits of $100,000 or more | $ 328,363 | $ 342,916

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- References No definition available. + Details
Name: | invest_InvestmentsScheduleAbstract
Namespace Prefix: | invest_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Industry Guide -Number 3 -Section V -Paragraph D-E + Details
Name: | us-gaap_TimeDeposits100000OrMore
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant